Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.08-3.122.9-3.5
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
Conchoidal
Cleavage
{010} Perfect
{110} Perfect, {???} Distinct, {???} Distinct
Mohs Hardness
7.55.5-6
2
10
👆🏻
Chemical Composition
BeAlSiO 4(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)